alpha and beta efficiencies for plastic scintillators

[CARL SPEER <speercl@EARTHLINK.NET>]

I am interested in learning what the typical alpha and beta efficiencies are for handheld surface contamination survey instruments and swipe counters at DOE facilities.  I am particularly interested in ZnS coated plastic scintillator probes such as the Eberline HP-380AB and the NE Technology DP6 probes.  What isotopes are used for calibration sources and if geometry factors, transmission factors and backscatter factors are considered in the calibration process?  At what distance are these probes from the calibration source?  I am aware of the stated efficiencies from the manufacturers but I have seen the efficiencies vary by 100% at different facilities. Please respond to speercl@earthlink.net  unless you think  the info would be beneficial for all.



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